论文部分内容阅读
AIM:To evaluate the protective properties of novel prostone ClC-2 agonist SPI-8811 in porcine model of gastric acid injury. METHODS:Porcine gastric mucosa was mounted in Ussing chambers and injured by bathing mucosal tissues in an HCl Ringer’s solution (pH = 1.5) with or without SP1-8811 (1 μmol/L), cystic fibrosis transmem-brane conductance regulator (CFTR) inhibitor (inhibitor 172, 10 μmol/L, apical) and ClC-2 inhibitor ZnCl 2 , 300 μmol/L, apical), on the apical surface of tissues. Transepithelial resistance and mucosal-to-serosal 3 H-mannitol fluxes were measured over a 90-min period. Tissues were analyzed by morph metric techniques, Immunofluorescence and by western blots. RESULTS:Compared with control tissues, acid exposure decreased transepithelial electrical resistance (TER) and increased 3 H-mannitol flux. Pretreatment of gastric mucosa with SPI-8811 was protective against acid-induced decreases in TER (TER, 50 Ω . cm 2 vs 100 Ω . cm 2 ) and abolished increases in flux ( 3 H-mannitol flux, 0.10 μmol/L . cm 2 vs 0.04 μmol/L . cm 2 ). Evidence of histological damage in the presence of acid was markedly at- tenuated by SPI-0811. Immunofluorescence and western analysis for occludin revealed enhanced localization to the region of the tight junction (TJ) after treatment with SPI-8811. Pretreatment with the ClC-2 inhibitor ZnCl 2 , but not the selective CFTR inhibitor 172, attenuated SPI-8811-mediated mucosal protection, suggesting a role for ClC-2. Prostone may serve both protective and reparative roles in injured tissues. CONCLUSION: ClC-2 agonist SPI-8811 stimulated enhancement of mucosal barrier function by protecting TJ protein occludin in porcine gastric mucosa and thus protected the gastric acid injury in porcine stomach.
AIM: To evaluate the protective properties of novel prostone ClC-2 agonist SPI-8811 in porcine model of gastric acid injury. METHODS: Porcine gastric mucosa was mounted in Ussing chambers and injured by bathing mucosal tissues in an HCl Ringer’s solution (pH = 1.5 ) with or without SP1-8811 (1 μmol / L), cystic fibrosis transmem- brane conductance regulator (CFTR) inhibitor (inhibitor 172, 10 μmol / L, apical) and ClC-2 inhibitor ZnCl 2, 300 μmol / L, ), on the apical surface of tissues. Transepithelial resistance and mucosal-to-serosal 3 H-mannitol fluxes were measured over a 90-min period. Tissues were analyzed by morphometric techniques, Immunofluorescence and by western blots. pretreatment of gastric mucosa with SPI-8811 was protective against acid-induced decrease in TER (TER, 50 Ω.cm 2 vs 100 Ω. cm 2 ) and abolished increases in flux ( 3 H-mannitol flux, 0.10 μmol / L cm 2 vs 0.04 μmol / L cm 2). Evidence of histological damage in the presence of acid was markedly at tenuated by SPI-0811. Immunofluorescence and western analysis for occludin revealed enhanced localization to the region of the tight junction (TJ) after treatment with SPI-8811. Pretreatment with the ClC-2 inhibitor ZnCl 2, but not the selective CFTR inhibitor 172, attenuated SPI-8811-mediated mucosal protection, suggesting a role for ClC -2. Prostone may serve both protective and reparative roles in injured tissues. CONCLUSION: ClC-2 agonist SPI-8811 stimulated enhancement of mucosal barrier function by protecting TJ protein occludin in porcine gastric mucosa and thus protected the gastric acid injury in porcine stomach.